This Add to Favorites icon is made in flat color style. This format was developed by Icons8 designer team and became immensely popular for use in web and mobile applications. Feel free to download this icon in PNG format for free, or unlock other formats for $5. Unlike other icon packs that have merely hundreds of icons, this monster icon pack contains 5,300 icons, all in the same style and quality.
There is a "plus" sign which is like a cross, but the sides are even, centered inside a five pointed star with all sides that are equal. Both are outlined in black. The star is "hollow" otherwise" in that there is empty space surrounding the icon. Everything is straight (there are no curved lines).